This resource is found in Bootup.pack.
Its canonical resource path is "Ecosystem/LevelSensor.byml".
All information related to difficulty (enemy and weapon) scaling is stored in this configuration file. Human-readable versions dumped from 1.0.0 and 1.5.0 are included in the botw-re-notes repo. A diff between 1.0.0 and 1.5.0 is also provided in the repo.
[1.4.0] Flag entries for Golden enemies, Igneo Talus Titan and Monk Maz Koshia were added to the kill point table. Weapon entries for the One-Hit Obliterator and Weapon_Sword_503 were also added to the weapon scaling list. They cannot receive any modifier. (Yes, the developers forgot to add golden enemies to the config in 1.3.0.)